20972867 has 2 divisors, whose sum is σ = 20972868. Its totient is φ = 20972866.

The previous prime is 20972851. The next prime is 20972873. The reversal of 20972867 is 76827902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20972867 - 2⁴ = 20972851 is a prime.

It is a super-2 number, since 2×20972867² = 879722300399378, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20972167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10486433 + 10486434.

It is an arithmetic number, because the mean of its divisors is an integer number (10486434).

Almost surely, 2^20972867 is an apocalyptic number.

20972867 is a deficient number, since it is larger than the sum of its proper divisors (1).

20972867 is an equidigital number, since it uses as much as digits as its factorization.

20972867 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 20972867 is about 4579.6142850681. The cubic root of 20972867 is about 275.7735443797.

The spelling of 20972867 in words is "twenty million, nine hundred seventy-two thousand, eight hundred sixty-seven".